Try to leave unchanged the Max Num Tape Buffers GuidoElia HELPPC _____
Da: Klint Price - ArizonaITPro [mailto:[EMAIL PROTECTED] Inviato: venerdì 7 novembre 2008 21.38 A: NT System Admin Issues Oggetto: Re: Comparing NT Backup speeds Michael, This is a test server in a test environment, and there is nothing else running on it, nor are there other servers connecting to it. I'm not sure what a third test would show. Klint Michael B. Smith wrote: I'm not sure I would jump to any conclusions after just two tests. I would start up Perfmon, add my disk and tape queues, and run it a couple more times to see what happens. Regards, Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP My blog: http://TheEssentialExchange.com/blogs/michael Link with me at: http://www.linkedin.com/in/theessentialexchange From: Klint Price - ArizonaITPro [mailto:[EMAIL PROTECTED] Sent: Friday, November 07, 2008 1:30 PM To: NT System Admin Issues Subject: Re: Comparing NT Backup speeds These registry settings are causing backup speed degradation in my environment, and I am curious if anyone could explain why. I have a HP StorageWorks DL380 g5, running Storage Server 2003 x64 with dual 2.3 Quad Core processors, and 5 GB RAM. I have a 2TB SAS connected array connected to a HP P800 controller, and then a HP Ultrium 920 SAS LTO-3 drive connected to a different controller (SAS LSI 3000) Using the original NTBackup registry values for the keys below (32,512,9), I was able to backup a 36GB file in 7 Min 13 seconds. I implemented these performance registry keys below (64,1024,16), ran the backup job again, and it took 11 min 47 seconds. What could be causing these "performance" changes to impact backup speeds so greatly? Klint Michael B. Smith wrote: Registry Changes for Optimizing NTBackup The first optimization to make for NTBackup performance is to change some registry keys that affect buffering. These changes can have a very positive impact on performance when writing to tape, and a smaller impact when writing to disk. They are as follows (in batch file syntax): reg add "HKCU\Software\Microsoft\Ntbackup\Backup Engine" /v "Logical Disk Buffer Size" /t REG_SZ /d 64 /f reg add "HKCU\Software\Microsoft\Ntbackup\Backup Engine" /v "Max Buffer Size" /t REG_SZ /d 1024 /f reg add "HKCU\Software\Microsoft\Ntbackup\Backup Engine" /v "Max Num Tape Buffers" /t REG_SZ /d 16 /f These registry changes double the default values. Do note that they affect HKEY_CURRENT_USER, and not HKEY_LOCAL_MACHINE as you might expect. Therefore, you should execute NTBackup under the desired user to create the registry key before you attempt to set the above registry values. Regards, Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP My blog: http://TheEssentialExchange.com/blogs/michael Link with me at: http://www.linkedin.com/in/theessentialexchange From: Joseph L. Casale [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 07, 2008 11:59 AM To: NT System Admin Issues Subject: RE: Comparing NT Backup speeds Michael, What are these tweaks you speak of? jlc From: Michael B. Smith [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 07, 2008 6:26 AM To: NT System Admin Issues Subject: RE: Comparing NT Backup speeds Well a local device will usually be faster than a remote device. Ntbackup, with the registry tweaks, gives me about 1 GB per minute locally. But I don't have a dat-72 to compare to. My home GB LAN with a cheap crappy switch copies about 50 MB/min. So I'm thinking that two hours seems more likely than 9 hours. Regards, Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP My blog: http://TheEssentialExchange.com/blogs/michael Link with me at: http://www.linkedin.com/in/theessentialexchange From: HELP_PC [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 07, 2008 7:28 AM To: NT System Admin Issues Subject: R: Comparing NT Backup speeds Yes the DAT device is local. Not applied registry tweaks GuidoElia HELPPC _____ Da: Michael B. Smith [mailto:[EMAIL PROTECTED] Inviato: martedì 7 ottobre 2008 13.05 A: NT System Admin Issues Oggetto: RE: Comparing NT Backup speeds Have you applied the "standard" registry tweaks to increase the ntbackup buffer size? Is the dat-72 locally attached? Regards, Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP My blog: http://TheEssentialExchange.com/blogs/michael Link with me at: http://www.linkedin.com/in/theessentialexchange From: HELP_PC [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 07, 2008 1:59 AM To: NT System Admin Issues Subject: Comparing NT Backup speeds In a network 10/100/1000 copper a NT backup of the complete server to a Qnap device RAID-1 takes about 9 hours with verify (about 50GB) versus DAT-72 with separate card that takes half the time . Should be considered normal ? TIA GuidoElia HELPPC ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
